|June 12, 2011, 21:31||
Method for solving the adjoint equations
Join Date: Jun 2010
Location: Yokohama, Japan
Posts: 160Rep Power: 6
I have run several cases and found it difficult to obtain a converged
solution of the adjoint N-S equations. I think it is related to the adjoint
transpose convection term. I use the SIMPLE algorithm to couple the
adjoint velocity and pressure.
What should I do to improve convergence of the adjoint equations?
Any information, however small, would be appreciated.
|June 13, 2011, 00:18||
Join Date: Apr 2011
Posts: 13Rep Power: 5
First, check that you should get a solution that converges. For high Re, (even about 40 in some cases), you would get a time-dependent solution. To check that it works for low Re, increase the viscosity, decrease the velocity, etc. If this doesn't work, there is a problem.
I don't know much about the SIMPLE algorithm, but if it involves solving a system of equations, try using a pre-conditioner. Without a pre-conditioner, I was not able to get a good result quickly. I implemented the gauss-siedel conditioner and it works like a charm. (Though maybe I should use SSOR!)
|Thread||Thread Starter||Forum||Replies||Last Post|
|Adjoint solver for flow problems||jelmer||OpenFOAM Running, Solving & CFD||10||November 10, 2011 02:55|
|CFD governing equations||m.gos||Main CFD Forum||0||April 30, 2011 14:21|
|Calculation of the Governing Equations||Mihail||CFX||5||July 25, 2008 17:29|
|A question about discrete adjoint method||Thomas||Main CFD Forum||3||August 9, 2006 12:37|
|What is Density-Based method?||C-H Kuo||Main CFD Forum||4||November 18, 1998 16:11|